Torsional vibration damper

Abstract

Torsional vibration damper, with a damper input part (2) and a damper output part (3), which are connected to one another via a spring damper device (4) and are rotatable relative to one another, wherein on the damper output part (3) on an annular disk-shaped section one or more axially projecting stop elements (15) formed by local deformations of the section are provided, which limit an axial movement of the damper output part (3) relative to the damper input part (2) by striking the damper input part (2).

Description

[0001] The invention relates to a torsional vibration damper having a damper input part and a damper output cable, which are connected to each other via a spring damper device and are rotatable relative to each other.

[0002] Such a torsional vibration damper, as known from EP 2 396 566 B1, is used, for example, in the drive train of a motor vehicle. A drive shaft, such as the crankshaft of an internal combustion engine, is connected to the damper input part, while the damper output part is connected to an output shaft, such as the input shaft of a transmission. The spring damper device connected between the damper input part and the damper output part makes it possible to damp vibrations and rotational irregularities on the input side. The spring damper device couples the damper input part to the damper output part, allowing them to rotate together.However, they can also be rotated relative to each other in a damped manner via the spring damper device, so that any vibrations or rotational irregularities on the input side are absorbed by the damper device and a virtually vibration-free or uniform rotational movement can be taken from the damper output part.

[0003] The damper input and output sections rotate around a common axis and are therefore axially joined. A spring diaphragm is sometimes mounted between them, which is attached to the damper output section and frictionally engages the damper input section. This spring diaphragm closes the annular receiving area, which houses the spring damper device and is provided on the damper input section. Handling errors or transport of the torsional vibration damper can lead to axial displacement or tilting of the damper input section relative to the damper output section. This leads to undesirable axial forces acting, for example, on the spring diaphragm, which can then be plastically deformed or destroyed.

[0004] The invention is based on the problem of providing an improved torsional vibration damper.

[0005] To solve the problem, in a torsional vibration damper of the type mentioned at the outset, it is provided according to the invention that one or more axially projecting stop elements formed by local deformations of the section are provided on the impeller output part on an annular disk-shaped section, which stop elements limit an axial movement of the damper output part to the damper input part by striking the damper input part.

[0006] The torsional vibration damper according to the invention is characterized by one or more stop elements that protrude axially on an annular disc-shaped section of the damper output part in the form of through-positions, i.e., local deformations, thus extending toward a stop surface of the damper input part. The stop element(s) serve to limit any axial movement of the damper output part relative to the damper input part, resulting from handling errors or any movements during transport, by striking the damper input part. This means that only a limited, defined axial mobility of the damper input part relative to the damper output part is possible.This limited axial mobility consequently reduces axial displacement or tilting to a level that ensures that no unwanted excessive forces act on other components, such as a spring diaphragm, which could lead to their impairment. Because the stop element(s) are integrally formed on an annular disc-shaped section of the damper output part, i.e., on a section that is already provided as part of the damper output part, no additional stop means are required to form or provide the stop elements. Rather, the stop element(s) are formed directly on the annular disc-shaped section of the damper output part, for which purpose the section is correspondingly reshaped.Preferably, the stop element(s) are formed by means of through-positions, i.e., a suitable tool is used to press in on one side of the section so that the corresponding, axially projecting stop element is formed on the other side.

[0007] The torsional vibration damper according to the invention is therefore characterized by an integrated safety mechanism that can be used to limit and prevent excessive axial movements or tilting in a simple and efficient manner. Furthermore, it is also characterized by the ease of integration of this safety or limiting mechanism, since, according to the invention, the stop element(s) are provided as one-piece elements directly on a pre-designed part, namely the annular disc-shaped section, of the damper output section.

[0008] Preferably, the section is provided with several stop elements distributed equidistantly around the circumference. This design offers the possibility of supporting or securing the two parts against each other at several positions around the circumference.

[0009] It is particularly preferred if the annular disk-shaped section is formed via a flange component on which the stop elements are formed by axial through-holes. This flange component, as part of the damper output part, forms corresponding support sections on which the damper springs are supported, viewed in the circumferential direction. One end of the damper springs rests against the flange component, i.e., the damper output part, while the other end of the damper springs rests against corresponding support sections on the damper input part. For this purpose, the damper input part has a radially circumferential, channel-like receiving area in which the damper springs are received and into which the flange component protrudes with its corresponding support sections. This flange component is therefore an integral component of the damper output part, which, in addition to forming the stop element(s), is correspondingly deformed or through-holeed.

[0010] The flange component preferably has two or more radially extending support sections on which springs of the spring damper device are supported, with an axially projecting stop element being provided on some or all of the support sections. For example, two support sections are provided on which the ends of two arcuate damper springs, typically coil springs, are supported. In this case, two stop elements would be provided. Of course, more than two support sections can be provided around the circumference of the flange component, correspondingly, of course, also multiple damper springs, and additional stop elements can also be provided at other positions if necessary.

[0011] As described, the stop element(s) for axial movement limitation engages a corresponding stop section of the damper input part. For this purpose, the damper input part preferably has a ring-shaped cover part against which the stop element(s) engage. This cover component defines the previously described spring channel, in which the damper springs of the spring-damper device are accommodated. This cover component is now also used as a stop component, meaning that an already existing component is given additional utility.

[0012] The stop element(s) themselves are expediently designed as knob-like elevations, preferably round in cross-section. As described, these are designed as through-holes, meaning that a suitable forming tool is used to press in on one side of the section or flange component, resulting in the corresponding formation of an elevation, i.e., the stop element, on the other side.

[0013] The stop elements themselves should protrude axially by at least half the thickness of the section or flange component. The section or flange component is a metal component or sheet metal element with a corresponding thickness of several millimeters, so that the stop element(s) also protrude axially by several millimeters from the surface of the section.

[0014] As described, a spring diaphragm can be provided, which is arranged on the damper output part and supported against the damper input part. This seals the damper interior and in particular the space of the spring damper device and slides directly against the damper input part or against a slip ring provided on the damper input part. As described, the damper input part has a cover component that delimits the spring channel and is preferably used as a stop element, against which, in this case, the spring diaphragm also rests. Therefore, viewed radially, the stop element(s) is / are located further outward than the outer circumference of the spring diaphragm, so that the stop element(s) can strike directly against the cover component.

[0015] The invention is explained below using exemplary embodiments with reference to the drawings. The drawings are schematic representations and show: Fig. 1 a schematic diagram, sectioned, of a torsional vibration damper according to the invention, Fig. 2 a sectional view similar Fig. 1 without damper springs shown, Fig. 3 a perspective view of the flange component of the damper output part in a first view, and Fig. 4 a perspective view of the flange component from Fig. 3 from the other side.

[0016] Fig. Figure 1 shows a torsional vibration damper 1 according to the invention, comprising a damper input part 2 and a damper output part 3, which are connected to each other via a spring damper device 4. The torsional vibration damper 1 serves to transmit a torque introduced via an input part 5, for example, a crankshaft of an internal combustion engine, to an output part 6, for example, an input shaft of a transmission. Any vibrations or rotational irregularities at the input part 5 can be dampened via the spring damper device 4, so that a virtually vibration-free and uniform rotation is transmitted to the output part 6.

[0017] The damper input part 2 has an annular disc-shaped input flange part 7, on which, radially outwardly, an annular disc-shaped cover component 8 is arranged, which together define a spring channel 9 in which the spring damper device 4 or its damper springs 10 are accommodated in a conventional manner. The damper output part 3 has a flange component 11, which is connected via a riveted connection 12 to a hub component 13, which in turn is coupled to the output part 6 via a toothed connection. Furthermore, a spring membrane 14 is attached to the damper output part 3 via the riveted connection 12, comprising a plurality of individual rivets distributed in the circumferential direction. This spring membrane 14 rests in a sliding manner against a slip ring 19, which is arranged on the cover component 8 of the damper input part 2.

[0018] The function of the torsional vibration damper 1 is to impart a rotary movement to the damper input part 2 via the input part 5. The damper input part 2 is coupled to the damper springs 10 via corresponding support sections that protrude into the spring channel 9. The damper springs 10, in turn, are supported on further support sections formed on the flange component 11, which in turn is part of the damper output part 3. This means that the damper capture part 2 and the damper output part 3 are coupled to one another via the spring damper device 4 or their damper springs 10, but are rotatable relative to one another within the scope of the spring elasticity. A vibration introduced via the damper input part 2 is consequently absorbed by the damper springs 10, so that a virtually or completely vibration-free rotary movement is imparted to the damper output part 3.The basic structure and function of such a torsional vibration damper 1 is known.

[0019] To prevent any handling errors or movements during transport or assembly from leading to excessive axial movement of the damper output part 3 relative to the damper input part 2, i.e., to an axial stroke or tilting, appropriate securing means are provided to limit the axial mobility of the damper input part 2 relative to the damper output part 3. For this purpose, a plurality of stop elements 15 are preferably provided on the damper output part 3, which axially limit any movement of the damper output part 3 relative to the damper input part 2, so that any axial stroke or tilting is only possible in a defined and limited manner. This is because such an axial stroke or tilting, if too great, can have adverse effects, for example, on the spring membrane 14, which can become deformed or even damaged as a result.

[0020] To realize this safety mechanism comprising the stop elements 15, the stop elements 15 are formed in one piece, i.e. integrally on the flange component 11, as Fig. 1, but also Fig. 2. They are designed as axial through-positions, which means that on the side of the flange component 11 facing the damper input part 2, corresponding indentations 16 are provided, which are made with a forming tool and which in turn lead to axial projections on the opposite side of the flange component 11, i.e. the stop elements 15, which project axially in the direction of the cover component 8, as shown in Fig. 1 and Fig. 2 clearly shows this. The stop elements 15 end just before the cover component 8, so that there is only a small distance between the stop elements 15 and the cover component 8, which distance ultimately defines the maximum axial mobility. Thus, if the stop elements 15 run against the cover component 8, the axial movement is limited to a degree that ensures that there is no adverse impairment of, for example, the spring membrane 14.

[0021] The Fig. 3 and Fig. 4 show two perspective views of the flange component 11 from the respective two sides. Fig. 4 shows the side on which the corresponding indentations 16 are made, while Fig. 3 shows the side facing the cover blue part 8, where the corresponding knob-like stop elements 15, which are round in cross-section, protrude axially. The indentations 16 are made with a corresponding tool designed to form the stop elements 15 in the desired geometry on the other side.

[0022] The depth of the indentations 16 is dimensioned such that the resulting stop elements 15 preferably project axially to the side by at least half the thickness of the section, in this case the flange component 11.

[0023] The Fig. 3 and Fig.4 shows a more detailed illustration of the flange component 11, which, in the assembled position, is connected to the hub component 13 via the riveted connections 12. As described, the damper springs 10 are supported on the flange component 11. For this purpose, the flange component 11 in the example shown has two radially extending support sections 17, on which corresponding stop sections 18 are formed on both sides, against which the damper springs 10, usually coil springs, are supported in the circumferential direction. In the example shown, the two stop elements 15 are formed on the two support sections 17. Instead of just two such support sections 17, it is also conceivable to provide more support sections 17, then distributed equidistantly around the circumference, optionally connected to a corresponding number of stop elements 17.

[0024] The stop elements 17 are therefore designed as an integral part of the flange component 11, which is already a mandatory functional component of the torsional vibration damper 1. This means that an already existing component is additionally used to integrate the axial locking mechanism. This is because the stop elements 15 are formed by a simple deformation of the flange component 11. The already existing cover component 8, which serves to complete the annular spring channel 9, is also used within the framework of the axial locking mechanism; it also has an additional function as a stop plane, since the stop elements can strike against it to limit axial movement. The invention therefore integrates an axial movement limiting mechanism without having to integrate a single additional component. List of reference symbols 1 torsional vibration damper 2 Damper input part 3 Damper output part 4 spring damper device 5 Entrance part 6 Output part 7 Input flange part 8 Cover component 9 spring channel 10 damper spring 11 Flange component 12 riveted joint 13 Hub component 14 Spring membrane 15 Stop element 16 indentation 17 support section 18 Stop section 19 Slip ring QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] EP 2 396 566 B1

[0002]

Claims

[1] Torsional vibration damper, with a damper input part (2) and a damper output part (3), which are connected to each other via a spring damper device (4) and are rotatable relative to each other, characterized by that on the damper output part (3) on an annular disc-shaped section one or more axially projecting stop elements (15) formed by local deformations of the section are provided, which limit an axial movement of the damper output part (3) to the damper input part (2) by striking the damper input part (2). [2] Torsional vibration damper according to claim 1, characterized by that several stop elements (15) distributed equidistantly around the circumference are provided on the section. [3] Torsional vibration damper according to claim 1 or 2, characterized by that the annular disc-shaped section is formed by a flange component (11) on which the stop elements (15) are formed by axial through-positions. [4] Torsional vibration damper according to claim 3, characterized by that the flange component (11) has two or more radially extending support sections (17) on which springs (10) of the spring damper device (4) are supported, wherein an axially projecting stop element (15) is provided on some or all of the support sections (17). [5] Torsional vibration damper according to one of the preceding claims, characterized by that the damper input part (2) has an annular disc-shaped cover component (8) against which the stop element(s) (15) strike. [6] Torsional vibration damper according to one of the preceding claims, characterized by that the stop elements (15) are designed as knob-like elevations, preferably round in cross-section. [7] Torsional vibration damper according to one of the preceding claims, characterized in that the stop elements (15) project axially by at least half the thickness of the section. [8] Torsional vibration damper according to one of the preceding claims, characterized by that a spring membrane (14) is provided which is arranged on the damper output part (3) and is supported against the damper input part (2).

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